Pipe-heating apparatus



3 Sheets-Sheet 1 Filed Sept. 6. 1929 v INVENTOR BY W W V ATTORNEYS Jan. 13, 1931. c. D. BARR PIPE HEATING APPARATUS Filed Sept. 6, 1929 3 Sheets-Sheet 2 WWW m wzrmm E C 1 mm C Jan. 13, 1931. c. BARR 1,788,611

PIPE HEATING APPARATUS Filed Sept. 6; 1929 s Sheets-Sheet 5 1 NVENTOR 62 AFf/VCZ'J 54m? A'ITORNEY5 the like.

' thatvportion 'of thecomposition in comes Wit-h thepipes; or, ,tothe' addition of heat to" v 1 Wardlyja's indicated in fuilf and dotted lines Patented Jan. 2 o

' crARENcE ID. mm on B RMINGHAM, nABA 1 viA,;n-ssmuonro AtrERrcAN'cA sr :IRQ N' 12E 0 ()F'BlRlvlINGl-lAM ALABlkMA, Aj coni er-marrow OFGEORGIA This invention, is air impro' -v 'ement in pipe heating apparatus; and more particularly 'in T an oven for heating cast iron pipe'prepara- Cast pipes are usually coated' by clipping them a substance-, such as asphalt, tari or the like, the substance heingbrought into and: proper consistency means ained at the it of heat.

z 7 The depth a arenes of thecoatingdepends, among other factors, upon the temper- 'atu-reof the coating material, and to attain a selected thickness over a series ofsuccessive le'operations, it is apparent that the temperature of'the composition mustv be maintained .constant. e m

, I Not only must theheat-a'pplied totheco-m position be constant,-but the temperaturefot 2 the pipesto be coated must betaken masonsideratio'n. I Ifsthe' pipes are colder than the; composition, the coatingwillbethicker while if the pipes are-hotter than the composition, the coatingwill be thinner.

This is due to the abstraction a heat from suchjopo'rtion from the pipeyso tl iatunless there is correspondencebetween the temperaturesiof pipe. and composition, thecoating will not be uniform.

@ne of the primary objects of t- 'efiresent" invention-isthe provision of an-apparatus enabling castings; such-as pipesyto behea'ted toa selected temperature, with the, distribu v tidn of 'heat uniform throughout the length an-dthe circumference of the pipe.

Another object-is the provisloniof rat us, enabling rapid and uniform heating of y the pipes, by directimpingement ofa flame,

thusto lessen-the timer'equi red foruniform heating-to obtain economy in; fuel and'joply fir tlie ho odl Thismedianism includesa cylin derl i,inwhichisarrangeda piston15 'l he;

novehcombination of parts fully described ".tory tocoating the same with asphalt, tam-or .7 V'Fig 2 is-an' end View A and other objects in" iew the" ,inv'ention consists in the construction and nd minor details of constructiouwithj 1 scope of the claimg nmygb'g resorted I I g ep t the; spirit of the inverts ion. o H

In thedraWi-ngs rt Fig- 1 aflolafr View of thee-im r p; paratus. l a a tion a suitable,frame-is provided, consisting with parts section;

Ofco 1 mounted "on a base 2 and sup,

shown," and carryingcross plates 5 near: the

said lower end. The heating apparatus isar'rang'ed belowthestructure4, between the" columns; hood is providedf'orcover ing the pipes in the even during the'heating;

" ort-l ng; girders 3 at ztheirtops. A skeleton v The Lhoocl .is 'c'om-posed of similar sections 6; eaclr of which is flanged downwardly as" shown, its outer side and, ends; and the' sectionsjare hinged to a common connection 7 at -t-he bottom ofgthe 1structure 4, so; that the sections may swlng upwardly and doWnin Fig -S inflexible member: Sis "connected to :the," ouierrside' of eachsection, andv these flexible memberse'xtend inwardly and upward'ly as connection with another member .9. Referring to re -W111 be seen that} the' connectionsjbetyveenthe flexible members 8 andthe; hood" sections, aresby means of sti'rjrups: :10-,Jthe stirrup'arms being pivoted to:.

the hoodf section, while; thefiexible' memberfl is connected tothe body" of the stirrup.

' The'fle xible memberi); passesover. a pulley'l:

flexible member from the pulleym passes:

beneath the pulley 1'6 at the bottom of the cylinder- ,7andiupwardly over a pulley 17 jour naled iat thei'top:of thepisoni :Fronrthe pulley-17 the flexible"member passes. to suitable fixed: connection, andiit Willi be 'apf occupies the POSlilOlISllOWn 1n Fig. 3, on theparent that when the piston moves upward,

the connections 8 are moved upward, and the hood sections are lifted, as indicated indotted lines in Fig. 3.

Mechanism is provided for automatically engaging the hood sect-ions when elevated, and for holding them in such position. This mechanism comprises angle latches 18, pivoted at 19 to the cross plates 5 before men tioned. Eachof the angle latchesnormally depending ends clear, so that no impedimentis offeredto the upward swinging of the hood sections. Referring to Fig. .3, it will'be noticed that the inner lower'corners of the end'flanges of the hood sections are cut away, as'shown at 23. The oven with which the hood cooperates is arranged directly below I the hood, so that when the hood sections are in the position of Fig. 3, they will rest upon the defining wall of the oven.

The oven, which is composed of concrete or the like, is an" open box, composed of a bottom 24, and side and end walls 25 and 26, and he upper edges ofthe side and end walls serve as a seat for the flanged edges of the hood sections when they are in loweredposition. A number ofpairs of rollers 27 is supported in the oven. These rollers are mounts ed on stub shafts 28, which are journaled in cross bearing plates 29 supported by the oven body. r

The members of each pair are in register, and spaced apart longitudinally of the oven "body, and the members of each pair lap the members of the succeeding pair, as shown in Figs. 1 and 2. ;Each pipe 30'is' supported by four rollers, that is, by two pairs, as clearly shown in Fig. 2, and the pipes are rotated during the heating, so that every part thereof'is subjected to the action of impinging flame to uniformly heat the same, by means of the rollers 27. Each stub shaft 28 has a pinion 31, which meshes with another pinion 32. journaled below the pinion 31, and

between the pinion and the similar pinion on t the adjacent stub shaft 28. That is, each pinion 32 meshes with two pinions 31. The pin- 'ions"31and 32are of the same size, and the stub shaft 28a-ot the central pinion 31 is ex tended through the adjacent end wall of the oven body, and is connected to a suitable motor 34, an electricalmotor in th'e'present instance, by means of-achaln and sprockets 35, the chain connecting sprocket/son the stub neath the pipes when they are on the rollers 27 The pipes -37 are connected with a commonl eader 38, and each of the pipes is per- "forated'on itsupper side, as zit-37w, throughout that portion of the pipe which is within the oven to enable the escape of gas. The pipes are arranged substantially the full length of the oven body, so that the en.-'

tire length of the pipemounted on the rollers is subjected to the action of the flaming gas issuing from the perforations or" the pipes 37;

The pipes to be heated are conducted tothe oven on rails 39 supported by pedestals 40. Rails 41 are arranged transversely of the oven body between the sets of rollers 27, and each rail 41' is pivoted at the opposite side of the;oven from the rails 39 toa support 43. The opposite ends of the rails are connected by a cross bar, and the crossbar at its center rests in a stirrup 44 at the upper end of a piston 45 arranged in a-cylinder 46.

Normally the rails 41 occupy the position shown in full lines in Fig. 2, and in such position the upper edges of the rails are below the bottoms of the pipes on the rollers 27.

WVhenit is desired to insert pipes in the oven,

fluid under pressure is admitted to the cylinders-14 and 46. The piston 15 lifts the hood sections into the dotted line position of Fig.1

3, thus leaving the interior of the oven accessible. .At the same time the rails 41 are liftedinto the dotted line position of Fig. 2,

and the pipes to be-heated, resting on the rails 39, are rolled upon the rails 41, and positioned with respect to the rollers 27. The cylinders 14 and '46 are now permittedto exhaust,the rails 41 move downward, and the pipes 30 come to rest upon the rollers 37. At the same time or soon thereafter, the hood sections move down into the full line position of Figs. 2 and 3. I V

The hood sections may be operated independently of the rails, or in sequence therewith; WVhen the hood sections are'liftedto the proper position, they. are so held by the latches 18. When the pipes are on the rollers 27, they are, rotated at a relatively slow speed, so that every part of each pipe throughout its length and circumference is subjected to the action of the flaming gas issuing from the perforations of'the pipes 37. 1

Whenthepipes have been heated to the proper temperature, fluid under pressure is again admitted to the cylinders 14 and 46, the hood sections are lifted, as are also the pipes, and they are rolled; out upon the rails 39 which con d v p p anism; I The p pesi reach the,

' the coating composition =1sheated b than is: perhaps desired,

.;the' pipes to a -selected *teni *t-henr oth'e coating mechid;v coating e temperature cle f the1eoating may ipesi are toos'hot,

composition at eXac tl' sired; so that the deptl be nicely gauged. I vThe ner tact therewith,,and-the coating is th 1- coo'ler that-l the composi. on, perhaps too thick, cooled by contact with: t s

a-selectedtemperatureof! I I U position,th-e depth; of coating r y be no calculated I 3 It will be noticedreferring' to Fig. '2, that the rails. l1 extend through;andfbeyonl the side Walls of the oven body-" hich are suitably-notched to enable thepassage-oftherails; V On'e'side allis also-notched" or-pro vided with openings forthe passagefof the.

'. pipes 37, and the motor and thecylinder 46 are arranged Within a pit 4'4 7 What is claimed as new is f- 1.In apparatus of the class described, means-to support and rotate pipes; to be heated, including sets of rollers, the rollers of each'set registering with the correspond ing rollers of thefiother set, and adjacent rollers lapping, means to rotate the rollers;

andheating pipes extending transversely of theaxes of the rollers."

' 2. In apparatus of! thehclass described, means to supportQa-nd rotate pipes to be heated, including sets of rollers, the rollers.

of each set registering with the corresponding'rollers of the other set, and adjacent rollers lapping, means to rotate the rollers,

heating pipes extending transversely of the axes of the rollers, an open top oven in Which therollers and pipes are mounted, and a ma hood for closing; the top 013 111 oven and enclosing the pipes to be heated.

.3. In apparartus.o1 the class described,

zlieans. to support and rotate pipes to. be

heated, including sets of rollers, 't he'grollers I of each setv registering with the correspondv111g rollers of the other set, and ad iacent rollers lapping, means to rotate therollers, heatling; pipes extending transversely of the axes of the rollers, an open top oven in which the rollers and pipes are mounted, a movable hood for closing thetop of the oven and enclosing the pipes to be heated, said hood composed of similar ections hinged on a"linetransverse to the Center of the oveny nd"means to raise and lower the outer sides of thelsections.

l. In apparatus of the *class descr bed,

i'neans to support and rotate pipesto 'be .1 heated, includingsets of rollers, the rollers of each set registering With-the corresponding rollers 01" the other set, and adjacent rollers lappin means to rotatethe' rollers, heating; pipes extendingtransversely of'the axes of the rollers, an open top oven in which the rollmeans to supportand rotatewpipes. to.

'l,'-an oven having heating meanswi n- \(hltill the supporting means is. arranged, and

hes

s and .pipesare mo -.in.ted,'az movable; hood? for. closingtlieytoptof the oven and enolosg 'ingthe: pipes tobe. heated said-hood com I posedjot similar sections hingeclon a line transverse to the center ofthe oven, means. to;

raise and'lower the outer sides: of theisections,

and latches operated by the: upwa rdg naoves merit oithe' sections 1 beyond a selected point toloclr them in li'fted position-l. .5 .'.Ill apparatus ofz-the class described, an oven having an ofpen't'op,iand provided-Withof rollers near-the; opposite ends thereoii, corresponding rollers of the sets belng in register, and each roller-lapping the adiacent "rollers, means. *itor rotating the rollers, and;

heatingpi-pes arranged transversely or the oven, andthe axes or the rollers;

6.:ll'l apparatus of the class; described,

means'to support and-- rotate pipes tor be heated, an. oven having heating means in.

which thesnpporting means is arranged, and

movable. top for the oven,.said top; includ ing a: zhoochcomposed of, similar." sections hingedlat approximately thicenter oi" the? oveijr, andmeans; for raising and. lowering the outer free sides of the sectionscr 7,311 apparatus of the class;

movable top; for the oven, said top-including a. hood composed: of similar sections hinged-at approximately the center of the oven, means raisingancl lowering the outer treesid'es-of the sections, and latches for automatically engaging and holding the sec"- tionsliited when they pass above a selected point. I

described,

.8. In apparatus of the class;

- an oven having an opentop, a. sectional hood 6 movable into and out. or position. abovethe Y oven to closeand open thetop,;ineanswith n..

the oven; and'below' the level orfi'the ton thereof.

to support and rotate plnrality of pipes; on

their longitudinalaxes, and means to simultaneously raiseand lower the pipes into aard' out of engagementxvi'th the rotating means.-

9*. In app aratusofr the class described, an

ovenhaving-fan open top a' sectional hood movable into and out of position abouethe ovenitoclose open the top, means Within. the: oven andbelow the level of the top thereof to support and rotateaplurality ofpipesion their longitudinal axes, and means to simul} "taneously; raise and lower the pipes: into and.

out oriengagement: Withthe rotating'ineansgf I said raising-means includingrailspivoted at,

oneside of the oven and passing beneath, the? pipes j vhen supported on the. rotating means; and hydraulic mechanismconnected; with the other end of the rails. Q I K 10. In apparatus of the-class the rollersofeach set being in register:

and the rollers of each set lapping adjacent rollers, the pairs of lapping rollers of the as they are rotated.

11'. In apparatus of the class described,

7 an oven having sets of. rollers journaled therein,the rollers of each set being in register with the corresponding rollers oi ,the other set, and the rollers of. each set lapping adjacent rollers, the pairs of lapping rollers of'the sets being adapted to support a pipe or the like, and means to rotate the rollers .at the same speed, a plurality of lines of fuel jets arranged beneath the pipes to heat them as they are rotated, said oven having an open top, and a hood movable into and out of position to close the top.

12-. In apparatus of the class described, an oven having sets of rollers j ournaled therein, the rollers of each set being in register with the corresponding rollers of the other set, and the rollers of each set lapping adjacent rollers, the pairs of lapping rollers of the setsbeing adapted to support a pipe or the like, and means to rotatethe rollers at the' same speed, a plurality of lines of fuel jets arranged beneath the pipes to heat them as they are rotated, said oven having an open top, and a hood movable into and out of position to close the top, said hood composed of sections hinged at approximately the center of the oven and adapted to swing at their free edges upwardly and away from the oven.

13. In apparatus of the class described, an oven having sets of rollers journaled therein, the rollers of each set being in register with the corresponding rollers of the other set, and the rollers of each set lapping adjacent rollers, the pairs of lapping rollers of the sets being adapted to support a pipe or the like, and means to rotate the rollers at the same speed, a pluralityof lines of fuel jets arranged'beneath the pipes to heat them as they are rotated, said oven having an open top, and a hoodi movable into and out of position to close thetop, said hood composed of sections hinged at approximately the center of the oven and adapted to swing at their free edges upwardly and away from the oven, and means for swinging the sections.

thempntothe rollers, and to deliver pipes' fromv the rollers to the top of the oven, said meansincluding rails hinged to one side of the oven, and lifting means-connected with the other ends of the rails.

Signed at Birmingham in the county of Jefierson and State of Alabama this 3rd day of September A. D. 1929.

, CLARENCE D. BARR.

14. In apparatus of the class described, an 7 l oven having sets ofrollers ournaled therein, the rollers of each set being in register with the corresponding rollers of the other set,

and therollers of each set lapping adj acent rollers, the pairs of lapping rollersjof the sets being adapted to support a pipe or the like, and means to rotate the rollers at the same speed, 'a plurality of lines of fuel jets arranged beneath the pipes to heat them as they are rotated, said oven having an open top, and a hoodmovable into and out of p05. 

